What D Cartwright said. Even after you’ve upgraded to WPMU 2.9 rc-1 where you can just paste on the YouTube link in Write/Edit panel, Vipers Video Quicktags help you add more customizations to your video, should you choose to.

When I post an update with a youtube-shortcode it first shows just the shortcode. But when I refreash the whole page, it shows me the youtube-video-picture – although it’s only the link, not the player. I guess there is some conflict with bp1.2-stream?